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1 | /* |
2 | * PCM Interface - misc routines |
3 | * Copyright (c) 1998 by Jaroslav Kysela <perex@perex.cz> |
4 | * |
5 | * |
6 | * This library is free software; you can redistribute it and/or modify |
7 | * it under the terms of the GNU Library General Public License as |
8 | * published by the Free Software Foundation; either version 2 of |
9 | * the License, or (at your option) any later version. |
10 | * |
11 | * This program is distributed in the hope that it will be useful, |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | * GNU Library General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Library General Public |
17 | * License along with this library; if not, write to the Free Software |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | * |
20 | */ |
21 | |
22 | #include <linux/time.h> |
23 | #include <sound/core.h> |
24 | #include <sound/pcm.h> |
25 | #define SND_PCM_FORMAT_UNKNOWN (-1) |
26 | |
27 | /* NOTE: "signed" prefix must be given below since the default char is |
28 | * unsigned on some architectures! |
29 | */ |
30 | struct pcm_format_data { |
31 | unsigned char width; /* bit width */ |
32 | unsigned char phys; /* physical bit width */ |
33 | signed char le; /* 0 = big-endian, 1 = little-endian, -1 = others */ |
34 | signed char signd; /* 0 = unsigned, 1 = signed, -1 = others */ |
35 | unsigned char silence[8]; /* silence data to fill */ |
36 | }; |
37 | |
38 | static struct pcm_format_data pcm_formats[SNDRV_PCM_FORMAT_LAST+1] = { |
39 | [SNDRV_PCM_FORMAT_S8] = { |
40 | .width = 8, .phys = 8, .le = -1, .signd = 1, |
41 | .silence = {}, |
42 | }, |
43 | [SNDRV_PCM_FORMAT_U8] = { |
44 | .width = 8, .phys = 8, .le = -1, .signd = 0, |
45 | .silence = { 0x80 }, |
46 | }, |
47 | [SNDRV_PCM_FORMAT_S16_LE] = { |
48 | .width = 16, .phys = 16, .le = 1, .signd = 1, |
49 | .silence = {}, |
50 | }, |
51 | [SNDRV_PCM_FORMAT_S16_BE] = { |
52 | .width = 16, .phys = 16, .le = 0, .signd = 1, |
53 | .silence = {}, |
54 | }, |
55 | [SNDRV_PCM_FORMAT_U16_LE] = { |
56 | .width = 16, .phys = 16, .le = 1, .signd = 0, |
57 | .silence = { 0x00, 0x80 }, |
58 | }, |
59 | [SNDRV_PCM_FORMAT_U16_BE] = { |
60 | .width = 16, .phys = 16, .le = 0, .signd = 0, |
61 | .silence = { 0x80, 0x00 }, |
62 | }, |
63 | [SNDRV_PCM_FORMAT_S24_LE] = { |
64 | .width = 24, .phys = 32, .le = 1, .signd = 1, |
65 | .silence = {}, |
66 | }, |
67 | [SNDRV_PCM_FORMAT_S24_BE] = { |
68 | .width = 24, .phys = 32, .le = 0, .signd = 1, |
69 | .silence = {}, |
70 | }, |
71 | [SNDRV_PCM_FORMAT_U24_LE] = { |
72 | .width = 24, .phys = 32, .le = 1, .signd = 0, |
73 | .silence = { 0x00, 0x00, 0x80 }, |
74 | }, |
75 | [SNDRV_PCM_FORMAT_U24_BE] = { |
76 | .width = 24, .phys = 32, .le = 0, .signd = 0, |
77 | .silence = { 0x00, 0x80, 0x00, 0x00 }, |
78 | }, |
79 | [SNDRV_PCM_FORMAT_S32_LE] = { |
80 | .width = 32, .phys = 32, .le = 1, .signd = 1, |
81 | .silence = {}, |
82 | }, |
83 | [SNDRV_PCM_FORMAT_S32_BE] = { |
84 | .width = 32, .phys = 32, .le = 0, .signd = 1, |
85 | .silence = {}, |
86 | }, |
87 | [SNDRV_PCM_FORMAT_U32_LE] = { |
88 | .width = 32, .phys = 32, .le = 1, .signd = 0, |
89 | .silence = { 0x00, 0x00, 0x00, 0x80 }, |
90 | }, |
91 | [SNDRV_PCM_FORMAT_U32_BE] = { |
92 | .width = 32, .phys = 32, .le = 0, .signd = 0, |
93 | .silence = { 0x80, 0x00, 0x00, 0x00 }, |
94 | }, |
95 | [SNDRV_PCM_FORMAT_FLOAT_LE] = { |
96 | .width = 32, .phys = 32, .le = 1, .signd = -1, |
97 | .silence = {}, |
98 | }, |
99 | [SNDRV_PCM_FORMAT_FLOAT_BE] = { |
100 | .width = 32, .phys = 32, .le = 0, .signd = -1, |
101 | .silence = {}, |
102 | }, |
103 | [SNDRV_PCM_FORMAT_FLOAT64_LE] = { |
104 | .width = 64, .phys = 64, .le = 1, .signd = -1, |
105 | .silence = {}, |
106 | }, |
107 | [SNDRV_PCM_FORMAT_FLOAT64_BE] = { |
108 | .width = 64, .phys = 64, .le = 0, .signd = -1, |
109 | .silence = {}, |
110 | }, |
111 | [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE] = { |
112 | .width = 32, .phys = 32, .le = 1, .signd = -1, |
113 | .silence = {}, |
114 | }, |
115 | [SNDRV_PCM_FORMAT_IEC958_SUBFRAME_BE] = { |
116 | .width = 32, .phys = 32, .le = 0, .signd = -1, |
117 | .silence = {}, |
118 | }, |
119 | [SNDRV_PCM_FORMAT_MU_LAW] = { |
120 | .width = 8, .phys = 8, .le = -1, .signd = -1, |
121 | .silence = { 0x7f }, |
122 | }, |
123 | [SNDRV_PCM_FORMAT_A_LAW] = { |
124 | .width = 8, .phys = 8, .le = -1, .signd = -1, |
125 | .silence = { 0x55 }, |
126 | }, |
127 | [SNDRV_PCM_FORMAT_IMA_ADPCM] = { |
128 | .width = 4, .phys = 4, .le = -1, .signd = -1, |
129 | .silence = {}, |
130 | }, |
131 | [SNDRV_PCM_FORMAT_G723_24] = { |
132 | .width = 3, .phys = 3, .le = -1, .signd = -1, |
133 | .silence = {}, |
134 | }, |
135 | [SNDRV_PCM_FORMAT_G723_40] = { |
136 | .width = 5, .phys = 5, .le = -1, .signd = -1, |
137 | .silence = {}, |
138 | }, |
139 | /* FIXME: the following three formats are not defined properly yet */ |
140 | [SNDRV_PCM_FORMAT_MPEG] = { |
141 | .le = -1, .signd = -1, |
142 | }, |
143 | [SNDRV_PCM_FORMAT_GSM] = { |
144 | .le = -1, .signd = -1, |
145 | }, |
146 | [SNDRV_PCM_FORMAT_SPECIAL] = { |
147 | .le = -1, .signd = -1, |
148 | }, |
149 | [SNDRV_PCM_FORMAT_S24_3LE] = { |
150 | .width = 24, .phys = 24, .le = 1, .signd = 1, |
151 | .silence = {}, |
152 | }, |
153 | [SNDRV_PCM_FORMAT_S24_3BE] = { |
154 | .width = 24, .phys = 24, .le = 0, .signd = 1, |
155 | .silence = {}, |
156 | }, |
157 | [SNDRV_PCM_FORMAT_U24_3LE] = { |
158 | .width = 24, .phys = 24, .le = 1, .signd = 0, |
159 | .silence = { 0x00, 0x00, 0x80 }, |
160 | }, |
161 | [SNDRV_PCM_FORMAT_U24_3BE] = { |
162 | .width = 24, .phys = 24, .le = 0, .signd = 0, |
163 | .silence = { 0x80, 0x00, 0x00 }, |
164 | }, |
165 | [SNDRV_PCM_FORMAT_S20_3LE] = { |
166 | .width = 20, .phys = 24, .le = 1, .signd = 1, |
167 | .silence = {}, |
168 | }, |
169 | [SNDRV_PCM_FORMAT_S20_3BE] = { |
170 | .width = 20, .phys = 24, .le = 0, .signd = 1, |
171 | .silence = {}, |
172 | }, |
173 | [SNDRV_PCM_FORMAT_U20_3LE] = { |
174 | .width = 20, .phys = 24, .le = 1, .signd = 0, |
175 | .silence = { 0x00, 0x00, 0x08 }, |
176 | }, |
177 | [SNDRV_PCM_FORMAT_U20_3BE] = { |
178 | .width = 20, .phys = 24, .le = 0, .signd = 0, |
179 | .silence = { 0x08, 0x00, 0x00 }, |
180 | }, |
181 | [SNDRV_PCM_FORMAT_S18_3LE] = { |
182 | .width = 18, .phys = 24, .le = 1, .signd = 1, |
183 | .silence = {}, |
184 | }, |
185 | [SNDRV_PCM_FORMAT_S18_3BE] = { |
186 | .width = 18, .phys = 24, .le = 0, .signd = 1, |
187 | .silence = {}, |
188 | }, |
189 | [SNDRV_PCM_FORMAT_U18_3LE] = { |
190 | .width = 18, .phys = 24, .le = 1, .signd = 0, |
191 | .silence = { 0x00, 0x00, 0x02 }, |
192 | }, |
193 | [SNDRV_PCM_FORMAT_U18_3BE] = { |
194 | .width = 18, .phys = 24, .le = 0, .signd = 0, |
195 | .silence = { 0x02, 0x00, 0x00 }, |
196 | }, |
197 | [SNDRV_PCM_FORMAT_G723_24_1B] = { |
198 | .width = 3, .phys = 8, .le = -1, .signd = -1, |
199 | .silence = {}, |
200 | }, |
201 | [SNDRV_PCM_FORMAT_G723_40_1B] = { |
202 | .width = 5, .phys = 8, .le = -1, .signd = -1, |
203 | .silence = {}, |
204 | }, |
205 | }; |
206 | |
207 | |
208 | /** |
209 | * snd_pcm_format_signed - Check the PCM format is signed linear |
210 | * @format: the format to check |
211 | * |
212 | * Returns 1 if the given PCM format is signed linear, 0 if unsigned |
213 | * linear, and a negative error code for non-linear formats. |
214 | */ |
215 | int snd_pcm_format_signed(snd_pcm_format_t format) |
216 | { |
217 | int val; |
218 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) |
219 | return -EINVAL; |
220 | if ((val = pcm_formats[format].signd) < 0) |
221 | return -EINVAL; |
222 | return val; |
223 | } |
224 | |
225 | EXPORT_SYMBOL(snd_pcm_format_signed); |
226 | |
227 | /** |
228 | * snd_pcm_format_unsigned - Check the PCM format is unsigned linear |
229 | * @format: the format to check |
230 | * |
231 | * Returns 1 if the given PCM format is unsigned linear, 0 if signed |
232 | * linear, and a negative error code for non-linear formats. |
233 | */ |
234 | int snd_pcm_format_unsigned(snd_pcm_format_t format) |
235 | { |
236 | int val; |
237 | |
238 | val = snd_pcm_format_signed(format); |
239 | if (val < 0) |
240 | return val; |
241 | return !val; |
242 | } |
243 | |
244 | EXPORT_SYMBOL(snd_pcm_format_unsigned); |
245 | |
246 | /** |
247 | * snd_pcm_format_linear - Check the PCM format is linear |
248 | * @format: the format to check |
249 | * |
250 | * Returns 1 if the given PCM format is linear, 0 if not. |
251 | */ |
252 | int snd_pcm_format_linear(snd_pcm_format_t format) |
253 | { |
254 | return snd_pcm_format_signed(format) >= 0; |
255 | } |
256 | |
257 | EXPORT_SYMBOL(snd_pcm_format_linear); |
258 | |
259 | /** |
260 | * snd_pcm_format_little_endian - Check the PCM format is little-endian |
261 | * @format: the format to check |
262 | * |
263 | * Returns 1 if the given PCM format is little-endian, 0 if |
264 | * big-endian, or a negative error code if endian not specified. |
265 | */ |
266 | int snd_pcm_format_little_endian(snd_pcm_format_t format) |
267 | { |
268 | int val; |
269 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) |
270 | return -EINVAL; |
271 | if ((val = pcm_formats[format].le) < 0) |
272 | return -EINVAL; |
273 | return val; |
274 | } |
275 | |
276 | EXPORT_SYMBOL(snd_pcm_format_little_endian); |
277 | |
278 | /** |
279 | * snd_pcm_format_big_endian - Check the PCM format is big-endian |
280 | * @format: the format to check |
281 | * |
282 | * Returns 1 if the given PCM format is big-endian, 0 if |
283 | * little-endian, or a negative error code if endian not specified. |
284 | */ |
285 | int snd_pcm_format_big_endian(snd_pcm_format_t format) |
286 | { |
287 | int val; |
288 | |
289 | val = snd_pcm_format_little_endian(format); |
290 | if (val < 0) |
291 | return val; |
292 | return !val; |
293 | } |
294 | |
295 | EXPORT_SYMBOL(snd_pcm_format_big_endian); |
296 | |
297 | /** |
298 | * snd_pcm_format_width - return the bit-width of the format |
299 | * @format: the format to check |
300 | * |
301 | * Returns the bit-width of the format, or a negative error code |
302 | * if unknown format. |
303 | */ |
304 | int snd_pcm_format_width(snd_pcm_format_t format) |
305 | { |
306 | int val; |
307 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) |
308 | return -EINVAL; |
309 | if ((val = pcm_formats[format].width) == 0) |
310 | return -EINVAL; |
311 | return val; |
312 | } |
313 | |
314 | EXPORT_SYMBOL(snd_pcm_format_width); |
315 | |
316 | /** |
317 | * snd_pcm_format_physical_width - return the physical bit-width of the format |
318 | * @format: the format to check |
319 | * |
320 | * Returns the physical bit-width of the format, or a negative error code |
321 | * if unknown format. |
322 | */ |
323 | int snd_pcm_format_physical_width(snd_pcm_format_t format) |
324 | { |
325 | int val; |
326 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) |
327 | return -EINVAL; |
328 | if ((val = pcm_formats[format].phys) == 0) |
329 | return -EINVAL; |
330 | return val; |
331 | } |
332 | |
333 | EXPORT_SYMBOL(snd_pcm_format_physical_width); |
334 | |
335 | /** |
336 | * snd_pcm_format_size - return the byte size of samples on the given format |
337 | * @format: the format to check |
338 | * @samples: sampling rate |
339 | * |
340 | * Returns the byte size of the given samples for the format, or a |
341 | * negative error code if unknown format. |
342 | */ |
343 | ssize_t snd_pcm_format_size(snd_pcm_format_t format, size_t samples) |
344 | { |
345 | int phys_width = snd_pcm_format_physical_width(format); |
346 | if (phys_width < 0) |
347 | return -EINVAL; |
348 | return samples * phys_width / 8; |
349 | } |
350 | |
351 | EXPORT_SYMBOL(snd_pcm_format_size); |
352 | |
353 | /** |
354 | * snd_pcm_format_silence_64 - return the silent data in 8 bytes array |
355 | * @format: the format to check |
356 | * |
357 | * Returns the format pattern to fill or NULL if error. |
358 | */ |
359 | const unsigned char *snd_pcm_format_silence_64(snd_pcm_format_t format) |
360 | { |
361 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) |
362 | return NULL; |
363 | if (! pcm_formats[format].phys) |
364 | return NULL; |
365 | return pcm_formats[format].silence; |
366 | } |
367 | |
368 | EXPORT_SYMBOL(snd_pcm_format_silence_64); |
369 | |
370 | /** |
371 | * snd_pcm_format_set_silence - set the silence data on the buffer |
372 | * @format: the PCM format |
373 | * @data: the buffer pointer |
374 | * @samples: the number of samples to set silence |
375 | * |
376 | * Sets the silence data on the buffer for the given samples. |
377 | * |
378 | * Returns zero if successful, or a negative error code on failure. |
379 | */ |
380 | int snd_pcm_format_set_silence(snd_pcm_format_t format, void *data, unsigned int samples) |
381 | { |
382 | int width; |
383 | unsigned char *dst, *pat; |
384 | |
385 | if (format < 0 || format > SNDRV_PCM_FORMAT_LAST) |
386 | return -EINVAL; |
387 | if (samples == 0) |
388 | return 0; |
389 | width = pcm_formats[format].phys; /* physical width */ |
390 | pat = pcm_formats[format].silence; |
391 | if (! width) |
392 | return -EINVAL; |
393 | /* signed or 1 byte data */ |
394 | if (pcm_formats[format].signd == 1 || width <= 8) { |
395 | unsigned int bytes = samples * width / 8; |
396 | memset(data, *pat, bytes); |
397 | return 0; |
398 | } |
399 | /* non-zero samples, fill using a loop */ |
400 | width /= 8; |
401 | dst = data; |
402 | #if 0 |
403 | while (samples--) { |
404 | memcpy(dst, pat, width); |
405 | dst += width; |
406 | } |
407 | #else |
408 | /* a bit optimization for constant width */ |
409 | switch (width) { |
410 | case 2: |
411 | while (samples--) { |
412 | memcpy(dst, pat, 2); |
413 | dst += 2; |
414 | } |
415 | break; |
416 | case 3: |
417 | while (samples--) { |
418 | memcpy(dst, pat, 3); |
419 | dst += 3; |
420 | } |
421 | break; |
422 | case 4: |
423 | while (samples--) { |
424 | memcpy(dst, pat, 4); |
425 | dst += 4; |
426 | } |
427 | break; |
428 | case 8: |
429 | while (samples--) { |
430 | memcpy(dst, pat, 8); |
431 | dst += 8; |
432 | } |
433 | break; |
434 | } |
435 | #endif |
436 | return 0; |
437 | } |
438 | |
439 | EXPORT_SYMBOL(snd_pcm_format_set_silence); |
440 | |
441 | /** |
442 | * snd_pcm_limit_hw_rates - determine rate_min/rate_max fields |
443 | * @runtime: the runtime instance |
444 | * |
445 | * Determines the rate_min and rate_max fields from the rates bits of |
446 | * the given runtime->hw. |
447 | * |
448 | * Returns zero if successful. |
449 | */ |
450 | int snd_pcm_limit_hw_rates(struct snd_pcm_runtime *runtime) |
451 | { |
452 | int i; |
453 | for (i = 0; i < (int)snd_pcm_known_rates.count; i++) { |
454 | if (runtime->hw.rates & (1 << i)) { |
455 | runtime->hw.rate_min = snd_pcm_known_rates.list[i]; |
456 | break; |
457 | } |
458 | } |
459 | for (i = (int)snd_pcm_known_rates.count - 1; i >= 0; i--) { |
460 | if (runtime->hw.rates & (1 << i)) { |
461 | runtime->hw.rate_max = snd_pcm_known_rates.list[i]; |
462 | break; |
463 | } |
464 | } |
465 | return 0; |
466 | } |
467 | |
468 | EXPORT_SYMBOL(snd_pcm_limit_hw_rates); |
469 | |
470 | /** |
471 | * snd_pcm_rate_to_rate_bit - converts sample rate to SNDRV_PCM_RATE_xxx bit |
472 | * @rate: the sample rate to convert |
473 | * |
474 | * Returns the SNDRV_PCM_RATE_xxx flag that corresponds to the given rate, or |
475 | * SNDRV_PCM_RATE_KNOT for an unknown rate. |
476 | */ |
477 | unsigned int snd_pcm_rate_to_rate_bit(unsigned int rate) |
478 | { |
479 | unsigned int i; |
480 | |
481 | for (i = 0; i < snd_pcm_known_rates.count; i++) |
482 | if (snd_pcm_known_rates.list[i] == rate) |
483 | return 1u << i; |
484 | return SNDRV_PCM_RATE_KNOT; |
485 | } |
486 | EXPORT_SYMBOL(snd_pcm_rate_to_rate_bit); |
487 |
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